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The atomic geometries of the ordered (2 × 2) and (√3 × √3)R30° phases of K, Rb, and Cs on Rh(111) in comparison with Ru(0001)

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Schwegmann,  Stefan
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Over,  Herbert
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Schwegmann, S., & Over, H. (1996). The atomic geometries of the ordered (2 × 2) and (√3 × √3)R30° phases of K, Rb, and Cs on Rh(111) in comparison with Ru(0001). Surface Science, 360(1-3), 271-281. doi:10.1016/0039-6028(96)00602-4.


Cite as: https://hdl.handle.net/21.11116/0000-0009-B6E0-C
Abstract
The local adsorption geometries of K, Rb and Cs in the (√3 × √3)R30° and (2 × 2) phases on a Rh(111) surface at coverages of 0.33 and 0.25 ML, respectively, are determined by analyzing LEED intensity data. For all (√3 × √3)R30° phases investigated, the three-fold hcp site is found. For the (2 × 2) overlayer, K remains in the hcp position, while Cs favors the on-top position. For the case of Rb-(2 × 2), LEED analysis suggests occupation of the unusual two-fold bridge site. Since LEED analysis of the Rb-(2 × 2) phase is not completely conclusive, additional experimental evidence is necessary to firmly establish this adsorption geometry.